Puller for fan-drive pulleys



`Juma- 30, 1925. A 1,544,235

M. J. JOHNSON ET AL A FULLER FOR FAN DRIVE PULLEYS Filed July 2 1, 1924 Patented June 30, 1925.

UNITED STATES PATENT oFFicE.

MORE/1S J. JOHNSON AND ALF C. SCHINNES, OF MINNEAPOLIS, MINNESOTA.

rULLnnl 'son FAN-naive PULLEYS.

Application filed July 21, 1924. Serial No. 727,128.

T0 al! iii/7mm it may concern.'

Be it known that we, hionnis J. JOHN- SON and ALF C. SoHINNns, citizens of the United States, residing in the city of Minneapolis, county of Hennepin, and State of Minnesota, have invented new and useful Improvements in Pullers for Fan-Drive Pulleys, of which the following is a specification.

Our invention relates to an improvement for pulling the ordinary fan drive pulley conventionally combined with a crank engaging clutch member from the crank shaft of an automobile engine. This type of pulley is usually arranged to turn in narrow contines at the rear of the radiator of an automobile and in such position is in acces sible to any of the ordinary tools for dislodgment thereby from its driven, key fitted position on the engine crank shaft.

An object of the invention is to provide a simple, durable and inexpensive tool adapted to be applied to a fan drive pulley of the character above described in the manner of the application thereto of an ordinary starting crank, said tool being easily and conveniently operated to pull said pulley from the engine crank shaft upon which it is mounted.

With the foregoing and other objects in View, which will appear in the following description, the invention resides in the novel combination and arrangement of parts and in the details of construction .hereinafter described and claimed.

In the drawings, Fig. 1 is a view in perspective, the same illustrating a tool embodying our invention and a fan drive pulley of the type to which said tool is applicable; Fig. 2 is a view illustrating the body of the tool, in section, and the screw therein, in elevation, the body and screw being further illustrated in operative relation with respect to a pulley and shaft, both shown in dotted lines; Fig. 3 is an end view of the tool and Fig. 4 is a view illustrating the method of application of the tool to a fan drive pulley in operative position on the crank shaft of an automobile engine.

Referring to the drawings, it will be ob served that we have used similar reference characters throughout the several views to indicate similar parts. The combined pulley and clutch to which the improvement is applicable, comprises a pulley 10 and a hub 11 thereon, said hub being formed with opposed ratchet-like claws 12, the tips of said Vclaws overreaching recesses 12a cut in the stock of the hub 11. The pulley 10 has an axial bore'therein, key seated in the usual manner, and, in accordance with the usual practice, is pressed onto the end of an engine crank shaft 13, the lit thus afforded between pulley and shaft being supplemented with the use of a key 14 in the key seat of the pulley 10 and in a companion key seat in the crank shaft 13. The bore at the forward end of the hub 11 is left open to receive the pin equipped tip of the ordinary starting crank, inserted, as'usual, through the front guard 15 of an automobile (Fig. 1).

In our tool, which includes an elongated tubular body 16 and a screw 17 threaded axially therein, it will be noted that said body resembles, in form, the shank of an ordinary starting crank. Thus shaped said body 16 is capable of being applied to the hub 11 on the pulley 10 in the manner of a starting crank. Opposed lugs 18 near the tip of the body 16 correspond with the end of the pin at the tip of the ordinary starting crank, said lugs 18 being adapted to c0- act with the claws 1Q; on the hub 11.

Referring' to Fig. 1, it will be seen that by inserting the tip of the body 16 into the hub 11 and twisting said body in a clockwise direction, the lugs 18 will be swung into the recesses 152n overreached by the tips of the claws 12. Thus firmly held by continuing such twisting force, the lugs 18 are interlockingly engaged with the claws 19, the result being that the body 16 is secureffl against withdrawal from the pulley 10. rEhe screw 17 is fitted to the bod)7 16 with a right hand thread and, when turned in a clockwise direction in said body, advances therein, the tip of said screw engaging the end of the shaft 13. Continuing' such rota-v tion of said screw 17, the abutment of the tip thereof against the shaft 18 causes the pulley 10 to be pulled from the shaftthrough the medium of the body 16. While the clockwise turning of the screw 17 operates through friction between said screw and body to twist the latter and thus secure the lugs 18 interlocked with the claws 12 on the hub, it may be found that an additionall torque-like force must be( expended upon the body 16 to keep the lugs 18 from backing out of the grip of said claws l2. To arrange for the application of such additional force to the bodyrflcG, we :enlarge said body at the head thereof and shoulder the saine as at 16a, whereby a wrench 1S) particularly adapted for the purpose, or an ordinary wrench may be applied to the head of the body 16. The screw -17 is also shouldered at therhead 17a thereof to receive a wrench for turning the same, another means for turning said screw residing ln the re movable handle-.pin 20, which has :a 'drijving itin tapered bore 2G fin saidhead.

In the employment of o tool, .it is obvious that no preliminary dismantling :of the automobile is required `preparatory to the removal of a pulley 10 from the engine andthe handleepin 20 .turned in thesaine direction. `Bearing against the shaft Y13, the screw .17 on continued rotation operates through the body 16, which is then yseemedv to the pulley 110to pull said pulley from its tightly fitted position on the en "L crank-shaft. Having performed its w the tool is readily detached from the grip of `the claws 12, merely through pe, itia-l counter-clockwise turn ofl the body 1G .with respect to the pulley 10.

Changes in the specific forin of our inventionas herein disclosed, may be made within the scope of what is claimed without departingfroni the spirit'ofour invention. Having described ourinvention, what -we claim as new and desire to protect by Let-ters Patent is: Y

1. In a device vforpulling from a shaft a wheel conventionally combined with a crank receiving hub having ratchet-like clutch claws formed therein, a tubular body, the headthereof being adapted to receive a tool for twisting said body, lugs near the tip of the body, said body being adapted to be inserted at ils tip in said hub and said lugs adapted to co-act with and interlockingly engage said claws under torque of the body, and a screw threaded within said body and adapted to be brought to bear at the tip thereof against the end of said shaft 1 of a. crank, a screw threaded axially in said body, Ineans for twisting said body in a direction Vto inierloclringly engage said lugs with said Aclutch member and ineans for turning the screw within the body to bring the tip thereof to bear against .-therend of said shaft. f

8. In a'device for pulling 'fron'r a shaft-an element including` claws radially related with respect to the. axis of the shaft, a body,a screw threaded :axially vinthe-bodyg ,and radial rlugs. on 'said body,y the lngs'being adapted to co-act With I,and .be gripped by saidcl'aws upon the application of twisting force to the body, the screw vbeingadapted to be turned in the body .to bringthe .tip thereof against the end of the shaft.

4l. Ina device for pulling from :a .shaft an lelement including a claw thereon, A*a body, a screw threaded in the body'and' adapted Vto be turned in one direction with respect iheretoIto bringtrhe tip ofsaid screw toil ar against the end -ofisaid shaft, and la member on the body for cofaction .with said claw,-

said inernber bein-g' :adapted to be lrieldinfinn terlooking engagement with-the clawfunder the yapplication of twisting 'force to said body in the said ldirection ofv rotation of said screw. 5.. In a device for pulling` `from a :shaft anelenient including a claw thereon, a body,

a screw threaded in the body and adapted V,to bear at the end tnereof against the end of said shaft, and a member `on the body designed to co-aca with said claw, said nie ber being adapted'to be held in interlocking engagement with the claw through .torque onrsaid body. 7

Intestiniony whereof., we have signed our naines to this specification.

v-Monius JonNsoN. ALF c. soHiNNus. 

